<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
  .title {
    font-size: 24px;
    color: chocolate;
    background-color: black;

    width: 200px;
    height: 200px;
  }
  </style>
</head>
<body>
  <div class="title">Hello World</div>
  <span>我是span元素</span>

</body>
</html>